Recently Active Chemistry Questions

What is Zone refining? ...

Why are pentahalides of Gr 15 elements more covalent than trihalides? ...

Why is the Central zone of a candle flame luminous? ...

Calorific value is expressed in kJ/g right? ...

Is there a specefic ratio or amount of CO and H2 individually in 1 unit mass of Water gas?? Or is it a mixture? ...

An electron, a proton and an alpha particle have kinetic energies of 16E,4E and E respectively. What is the qualitative order of their de Broglie wavelengths ? a)Ie>Ip=Ia b)Ip=Ia>Ie c)Ip>Ie>Ia d)Ia<Ie>>Ip ...

which electronic level would allow the hydrogen atom to absorb a photon but not emit one ? a)3s b)2p c)2s d)1s ...

The value of the magnetic moment of a particular ion is 2.83 BM. The ion is a)Fe2+ b)Ni2+ c)Mn2+ d)Co3+ ...

In PCl5 the bond angles in equatorial and axial planes are a)60° and 120° b)120° and 90° c)120° and 60° d)120° and 180° what does "equatorial and axial planes" mean here ? ...

Why is the Electron affinity of chlorine greater than that of Flourine? After all, the L shell of Flourine is meant to have 8 electrons. ...

pKb of NH3 is 4.74. The pH when 100ml of 0.01 M NH3 solution is 50% neutralised by 0.01 M HCL is plzz explain ...

pKa1, pKa2 and pKa3 of H3PO4 are x,y,z respectively . pH 0.1 M Na2HPO4 solution is ...

When a certain metal was irradiated with light of frequency 3.2 x 1016 Hz. Photoelectrons emitted had twice the kinetic energy as did photoelectrons emitted when the same metal was irradiated with light of frequency 2.0 x 101 ...

If positron is present in the nucleus of every substance, everything should have had a positive charge. Why is it not so? ...

How much ice will separate if a solution containing 25g of ethylene glycol[C2How much ice will separate if a solution containing 25g of ethylene glycol[C2H4(OH)2 in 100g of water is cooled to -10°C? Kf for water is 1.86 - Af ...

Supposing the energy of fourth shell for hydrogen atom is – 50 a.u. (arbitrary unit). What would be its ionization potential a)50 b)800 c)15.4 d)20.8 what is ionization potential? ...

654 g of zinc reacts with dil. HCl in an open vessel at 37oC liberating hydrogen. Calculate the work done by the hydrogen gas in Joules. What would be the work done by the same gas if the same reaction were carried in a seale ...

More is the hydration enthalpy of an ion, more vigorously will it dissolve in water. Why is it so? ...

I have read somewhere.. the maximum covalecy that an atom can show is the total no. of orbitals it has. Weather filled or unfilled... And so in case of Boron its 1 + 3 = 4 how can we find the max. covalency of an element like ...

is there any liquid non metal that is a good conductor of electricity? ...

How is CO+H2 prodced? ...

Which of the following are non-polar species ? a)AsO3- b) SO32- c)ClO3- d) NO3- ...

sir can u please explain how to derive the amount of energy associated in the nth shell of bohr's atomic model ...

Avagadro Number is the reciprocal of which number? (a)Mass Number (b)Atomic Number (c)Mass of a proton (d)Mass of an electron ...

Unpaired electron is present in which of the following species:- KO2, AlO2-, BaO2 and NO2+ Explain your answer. ...

How many atoms will be present in a unit cell of Buckminsterfullerene? What will the unit cell be shaped like? ...

In a flame test,can two different colours be observed one after another?Basically, can an electron jump more than once to a higher energy state? ...

question is in the image. please also explain. *Image* question is in the image. please also explain. ...

What is oxidation number of iron in Fe(CO)5? Explain how you have calculated. ...

ELECTROLYSIS....... while doing electrolysis of copper(2)sulphate using copper electrodes....y does copper frm anode deposit over cathode in an uniform way...???? it may so happen that the copper ions overlap over each other. ...